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How do I reinstall OS X Yosemite?
Boot from your Recovery HD partition by restarting your Mac while holding down the Command+R keys. The OS X Utilities window appears. Select Reinstall OS X, and click Continue. The OS X Yosemite splash screen appears.
How do I install OS X 10.10 on Yosemite?
Restart your computer, and immediately hold down command-r until the gray Apple logo appears. If prompted, select your main language and then click the arrow. Click Reinstall OS X, and then Continue. Follow the instructions on the screen, and then choose your hard disk.
Do you need to back up before installing OS X Yosemite?
You should back up your Mac before installation. You can back up with Time Machine, for example. Use the Mac App Store to install this update and other available updates. Some updates become available only after installing another update. Don’t interrupt the installation process after it has begun.
Why is the OS X Yosemite 10.10.5 update recommended?
The OS X Yosemite 10.10.5 update improves the stability, compatibility, and security of your Mac, and is recommended for all users. This update: Improves compatibility with certain email servers when using Mail. Fixes an issue in Photos that prevented importing videos from GoPro cameras.
Where do I install rEFInd on my computer?
Once you’ve obtained a rEFInd binary file, as described on the preceding page,you must install it to your computer’s EFI System Partition (ESP) (or conceivably to some other location). The details of how you do this depend on your OS and your computer (UEFI-based PC vs. Macintosh). The upcoming sections provide details.
How to install the rEFInd boot manager on Windows?
Installing rEFInd Manually Installing rEFInd Manually Using Linux Installing rEFInd Manually Using MacOS Installing rEFInd Manually Using Windows Installing rEFInd Manually Using an EFI Shell Installing rEFInd from within rEFInd